Reimplement Number.prototype.toString with non-default radix.

test/mjsunit/number-tostring.js

Index: test/mjsunit/number-tostring.js
diff --git a/test/mjsunit/number-tostring.js b/test/mjsunit/number-tostring.js
index 55655f408247a152db33f32ace0c0a5747c6eb48..602c94474438e26159b8ae3879c97e7f0ad08040 100644
--- a/test/mjsunit/number-tostring.js
+++ b/test/mjsunit/number-tostring.js
@@ -144,6 +144,13 @@ assertEquals("1e-7", (0.0000001).toString());
 assertEquals("8.8", (8.5).toString(16));
 assertEquals("-8.8", (-8.5).toString(16));
 
+assertEquals("1.1", (4/3).toString(3));
+assertEquals("11.1", (13/3).toString(3));
+assertEquals("0.01", (1/9).toString(3));
+assertEquals("10000", (81).toString(3));
+assertEquals("10000.01", (81 + 1/9).toString(3));
+
+
 // ----------------------------------------------------------------------
 // toFixed
 assertEquals("NaN", (NaN).toFixed(2));